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If y + 40x + 2 = 0, what is the value of xy?

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If y + 40x + 2 = 0, what is the value of xy? [#permalink]

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New post 06 Sep 2017, 09:26
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Question Stats:

81% (01:09) correct 19% (01:03) wrong based on 27 sessions

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If y + 40x + 2 = 0, what is the value of xy?

(1) 16x = –4y + 28

(2) 13y = 91 – 52x
[Reveal] Spoiler: OA

Last edited by Bunuel on 06 Sep 2017, 09:31, edited 2 times in total.
Added the OA.

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Re: If y + 40x + 2 = 0, what is the value of xy? [#permalink]

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New post 06 Sep 2017, 09:50
Could someone please help me with the explanation.
Since both the equations are simplified to form:

4x+y =7

How do we get xy in this case?

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Re: If y + 40x + 2 = 0, what is the value of xy? [#permalink]

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New post 06 Sep 2017, 10:05
1. We have two equation. Sufficient to find x and y values

Eliminate BCE

2. We have two equation. Sufficient to find x and y values

Hence, its D

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Re: If y + 40x + 2 = 0, what is the value of xy? [#permalink]

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New post 06 Sep 2017, 10:47
Statement 1 - solving the two equations x=-1/4 & y=8 hence xy=-2
Statement 2 - since it the same line hence the values of x & y will be the same as from statement 1. Hence answer is D

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Re: If y + 40x + 2 = 0, what is the value of xy? [#permalink]

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New post 07 Sep 2017, 07:08
dheerajkaushik90 wrote:
If y + 40x + 2 = 0, what is the value of xy?

(1) 16x = –4y + 28

(2) 13y = 91 – 52x

\(y + 40x + 2 = 0\) --------- (i)

(1) \(16x = –4y + 28\)

\(4x = -y + 7\)

\(y + 4x = 7\) -------- (ii)

Subtracting (i) and (ii) we can find the value of \(x\) and \(y\). Hence we can find the value of \(xy\).

Hence I is Sufficient.

(2) \(13y = 91 – 52x\)

\(y = 7 - 4x\)

\(y + 4x = 7\) ---------- (iii)

Subtracting (i) and (iii) we can find the value of \(x\) and \(y\). Hence we can find the value of \(xy\).

Hence II is Sufficient.

Answer (D)...

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Re: If y + 40x + 2 = 0, what is the value of xy? [#permalink]

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New post 07 Sep 2017, 08:21
What is the OA for the question

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Re: If y + 40x + 2 = 0, what is the value of xy?   [#permalink] 07 Sep 2017, 08:21
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